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Hace 5 horas · The air phase within a metamaterial cell is illustrated in Fig. 1Ciii, with its geometry determined by the cell walls shown in Fig. 1Di. These cell walls are strictly designed to mimic the natural ...
Hace 5 horas · Middle Ages c. AD 500 – 1500 A stained-glass panel from Canterbury Cathedral, c. 1175 – c. 1180, depicting the Parable of the Sower, a biblical narrative Including Early Middle Ages High Middle Ages Late Middle Ages Key events Fall of the Western Roman Empire Spread of Islam Treaty of Verdun East–West Schism Crusades Magna Carta Hundred Years' War Black Death Fall of Constantinople ...
Hace 1 día · Forced labour and slavery. The Underground Railroad was used by freedom seekers from Slavery in the United States and was generally an organized network of secret routes and safe houses. [1] Enslaved Africans and African-Americans escaped from slavery as early as the 17th century and many of their escapes were unaided, [2][3] but the network of ...
